The language is not vague because "three months before your travel date" is the earliest you can apply. For example, if you plan to travel on April 1, the earliest day to apply is three months before, or January 1. Any day after that three-months-before date qualifies.

The language is not vague because "three months before your travel date" is the earliest you can apply. For example, if you plan to travel on April 1, the earliest day to apply is three months before, or January 1. You may apply any time after that three-months-before date.